runtime: fix Breakpoint in ppc64x

Currently runtime.Breakpoint generates a SIGSEGV in ppc64. The solution is an unconditional trap similar to what clang and gcc do. It is documented in the section C.6 of the ABI Book 3. Fixes golang#52101
alexsaezm · Apr 1, 2022 · 364a743 · 364a743
1 parent 62d4c32
commit 364a743
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/src/runtime/asm_ppc64x.s b/src/runtime/asm_ppc64x.s
@@ -106,7 +106,7 @@ DATA runtime·mainPC+0(SB)/8,$runtime·main<ABIInternal>(SB)
 GLOBL runtime·mainPC(SB),RODATA,$8
 
 TEXT runtime·breakpoint(SB),NOSPLIT|NOFRAME,$0-0
- MOVD R0, 0(R0) // TODO: TD
+ TW $31, R0, R0
  RET
 
 TEXT runtime·asminit(SB),NOSPLIT|NOFRAME,$0-0